"newRiver" :
{
// Two-letters unique identifier for this river. Used in map format
"shortIdentifier" : "mr",
// Human-readable name of the river
"text" : "My Road",
// Name of file with river graphics
"tilesFilename" : "myRiver.def"
// Name of file with river delta graphics
// TODO: describe how exactly to use this tricky field
"delta" : "",
// If defined, river will be animated using palette color cycling effect
// Game will cycle "length" colors starting from "start" (zero-based index) on each animation update every 180ms
// Color numbering uses palette color indexes, as seen in image editor
// Note that some tools for working with .def files may reorder palette.
// To avoid this, it is possible to use json with indexed png images instead of def files
"paletteAnimation" : [
{ "start" : 10, "length" : 5 },
...
]
}